Tub



FIG. 1 is a top front perspective view of a tub showing my new design;

FIG. 2 is a left side perspective view, the right side being a mirror image thereof;

FIG. 3 is a front and left side perspective view, the right side being a mirror image thereof; and,

FIG. 4 is a top perspective view showing the left side and back.

The broken lines shown are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a tub, as shown and described. 